Method of welding.



F. G. HALDY.

METHOD OF WELDING.

APPLICATION FILED mm'z 1909.

9 1 4,946 Patented Mar. 9, 15909.

W TNESSES I 5 m/VEA/mg A fiorney I [y My invention relates to improvedmethod of welding, and the construction of the oint to be welded,and-more particularly to the the inner fibers under compression, thusmore uniform and perfect weld than can be as now universally made, andFig. 8 is a UNITED sTATns rafrianir enema.

FREDERICh G. HALDY, OF STAMFORD, CONNECTICUT, ASSIG NOR 'l'O THE YALE &TOWNE -MANUFACTURINGCOMPANY, OF STAMFORD, CONNECTICUT.

METHOD on WELDING. 1

Specification of Letters Patent.

Patented March 9, 1909.

Application filed. July 25, 1908. Serial No. 445,346.

To all whom it may concern:

Be it known that I, FREDERICK G. HALDY, of Stamford, in the, county ofFairlield and State of Connecticut, have invented certain new and usefulImprovements in Methods of Welding; and I do hereby declare thefollowing to be -a full, clear, and exact description of the invention,such as will enable others skilled in the art' to which it appertains tomake and use the same.

method of welding chain links, and chain link blanks' The object of myinvention is tosecure a secured with an electric welder between two flatabutting surfaces, and it consists in the formation of the abuttingfaces of-the parts to be welded, so that they make contact at a pointintermediate their margins, and preferably. at the center, from WlllCll)oint of contact the heat will be rapidly an uniformly conducted to themargins of the abut-' ting members.

In the accompanying drawings, Figure l is a View of my improved linkbefore welding. Fi 2 is aview of 'the bar from which the link is made.Fig. 3 is a view of a modified form of link and Fig. 4 is a view of thebar. Figs. 5, 6 and 7 are views showing the link view ofthe blan Linkblanks as now constructed are provided with flat abutting faces as at 1in Fig. 8, and when bent into the form shown in Fig. 5, the outer fibersare under tension and leaving an approximately V-shaped space 2 betweenthe ad acent ends as shownln Fig. 5. In order to secure a uniform andstrong weld, it is absolutely necessary to l generate and distribute theheat uniformly i ever the surfaces to be joined, but with point contactat one margin, and an air gap 1 gradually increasing in size from suchpoint contact to the other margin, this is impossihie. If the joint bemilled as shown in dotted lines in Fig. 6, to produce parallel faces,and l the ends of the link again forced together, a similar, butsomewhat smaller inverted V-shaped gap will result as shown at 3 in Fig.7, hence in welding these blanks by electricity, the heat localizes atthe point of contact-which results in burning the metal at such point,before the separated sections of the joint have reached aweldingtemperature. Ill order to overcome this defect I make the blank, shownin Fig. 2, with male and female ends 4 and 5 respectively, the anglesubtended by the male end being a trifle less than the angle of therecessed or female end to insure contact at the center, as shown in.Fig. 1, from which point the heat is conducted rapidly in all directionsto the margins. Again, as soon as the contact point begins to softenunder. the influence of the heat, the

end pressure, to which the link is subjected during the process ofelectric welding, causes the metal to flow from the center outwardly inall directions-thus com letely filling the gaps between the ends anforming a perfect weld. 1

In Fig. 5 I have shown one end of the blank rounded, the other endhaving a rounded or curved rounded recess. With this form I also makecontact at or near the center which is the fundamental featur'eof thisinvention.

It is evident that the blank may be provided with ends having centralpoint contact surfaces of other shapes than those shown, the generalidea being to provide the blank with male and female ends, hence I donot confine myself to the construction shown but consider myself atliberty to make such changes as fairly fall within. the spirit and scopeof my invention.

Having fully described my invention what I claim as new and desire tosecure by Lettens-Patent, is

1. The method of l'naking a chain link consisting in providing the linkblank with a point at one end and a recess in the other end, projectingthe pointed end into the recess ill. the other end and subjecting thejoint thus formed to pressure anda welding heat.

2. The method of making a chain. link consisting in providingia linkblank with a point at one end and a recess at the 013116]: end, i

' 111g wlt-msses.

forcing the pointed end into the recess in the blank by means of anelectric current and forcing the abutting and s1e.:-:c0ping andsWitnesses: together. I SQHUYLER MERRrrii',

In testimony whereof, I have sigrmd this j W'ARREN S. ABEL.

specification in the presel'me of two subsum-

